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Task/Best-shuffle/Python/best-shuffle-1.py

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+from collections import Counter
+import random
+
+def count(w1,wnew):
+    return sum(c1==c2 for c1,c2 in zip(w1, wnew))
+
+def best_shuffle(w):
+    wnew = list(w)
+    n = len(w)
+    rangelists = (list(range(n)), list(range(n)))
+    for r in rangelists:
+        random.shuffle(r)
+    rangei, rangej = rangelists
+    for i in rangei:
+        for j in rangej:
+            if i != j and wnew[j] != wnew[i] and w[i] != wnew[j] and w[j] != wnew[i]:
+                wnew[j], wnew[i] = wnew[i], wnew[j]
+    wnew = ''.join(wnew)
+    return wnew, count(w, wnew)
+
+
+if __name__ == '__main__':
+    test_words = ('tree abracadabra seesaw elk grrrrrr up a '
+                  + 'antidisestablishmentarianism hounddogs').split()
+    test_words += ['aardvarks are ant eaters', 'immediately', 'abba']
+    for w in test_words:
+        wnew, c = best_shuffle(w)
+        print("%29s, %-29s ,(%i)" % (w, wnew, c))